js/external/utils/amount.h

/*
 * This file is part of the Flowee project
 * Copyright (C) 2009-2010 Satoshi Nakamoto
 * Copyright (C) 2009-2015 The Bitcoin Core developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef FLOWEE_AMOUNT_H
#define FLOWEE_AMOUNT_H

#include "serialize.h"

#include <cstdlib>
#include <string>

constexpr int64_t COIN = 100000000;
constexpr int64_t CENT = 1000000;

/** No amount larger than this (in satoshi) is valid.
 *
 * Note that this constant is *not* the total money supply, which in Bitcoin
 * currently happens to be less than 21,000,000 BCH for various reasons, but
 * rather a sanity check. As this sanity check is used by consensus-critical
 * validation code, the exact value of the MAX_MONEY constant is consensus
 * critical; in unusual circumstances like a(nother) overflow bug that allowed
 * for the creation of coins out of thin air modification could lead to a fork.
 * */
static const int64_t MAX_MONEY = 21000000 * COIN;
inline bool MoneyRange(const int64_t& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }

/** Type-safe wrapper class for fee rates
 * (how much to pay based on transaction size)
 */
class CFeeRate
{
private:
    int64_t nSatoshisPerK; // unit is satoshis-per-1,000-bytes
public:
    CFeeRate() : nSatoshisPerK(0) { }
    explicit CFeeRate(int64_t _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) { }
    CFeeRate(int64_t nFeePaid, size_t nSize);
    CFeeRate(const CFeeRate& other) { nSatoshisPerK = other.nSatoshisPerK; }

    int64_t GetFee(size_t size) const; // unit returned is satoshis
    int64_t GetFeePerK() const { return GetFee(1000); } // satoshis-per-1000-bytes

    friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
    friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
    friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
    friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
    friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
    CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
    std::string ToString() const;

    ADD_SERIALIZE_METHODS

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
        READWRITE(nSatoshisPerK);
    }
};

#endif